I read this post the other night and then just saw this page. I was intrigued by the hands over the mouth/face of many of these men, then read up and learned that we often cover our mouths to hide emotion, in this case I think they are hiding that they're overwhelmed and on the verge of tears:
http://www.buzzfeed.com/mattbellassai/24-grooms-seeing-their-brides-for-the-first-time-6z51